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Chess Opening Theory/1. e4/1...c6/2. d4/2...d5/3. exd5/3...cxd5/4. Bd3
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Caro-Kann Exchange Variation rd nd bd qd kd bd nd rd pd pd pd pd pd pd pd pl bl pl pl pl pl pl pl rl nl bl ql kl nl rl Caro-Kann
Caro-Kann Exchange Variation
Nc6 is most common here, threatening the pawn.
Theory table
4... Nc6 4... Nf6 4... g6 4... e6
References
Caro-Kann
Nunns Chess Openings. 1999. John Nunn (Editor), Graham Burgess, John Emms, Joe Gallagher. 1-8574-4221-0.
Modern Chess Openings: MCO-14. 1999. Nick de Firmian, Walter Korn. 0-8129-3084-3.
Opening Repertiore: The Caro-Kann. 2015. Jovanka Houska 9781781942109